Run results for: undefined check tests - MeasureThat.net

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/85.0.4183.121 Safari/537.36

Browser: Chrome 85

Operating system: Windows

Device Platform: Desktop

Date tested: 4 years ago

Test name	Executions per second
typeof	720089408.0 Ops/sec
IIFE	718474752.0 Ops/sec
void	710439424.0 Ops/sec

Tests:

typeof
var name; typeof(name) === 'undefined'
AخA

var name;
typeof(name) === 'undefined'
IIFE
var name; name === (function(window, undefined){ // undefined }(this))
var name;
name === (function(window, undefined){
// undefined
}(this))
void
var name; name === void(0)
var name;
name === void(0)